1. Pneumology Department, Facultad de Medicina, Hospital General Universitario Gregorio MarañonUniversidad Complutense de Madrid (UCM), Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM) Madrid Spain
2. Health Sciences Faculty, Department of Preventive Medicine and Public HealthRey Juan Carlos University Madrid Spain
3. Internal Medicine Department, Facultad de Medicina, Hospital Universitario Clínico San Carlos, Facultad de MedicinaUniversidad Complutense de Madrid (UCM) Madrid Spain
4. Internal Medicine Department, Facultad de Medicina, Hospital General Universitario Gregorio MarañónUniversidad Complutense de Madrid (UCM) Madrid Spain